chore(duo): hide and deprecate 'glab duo ask' command

Kai Armstrongrequested to merge
deprecate-duo-ask into main

Summary

  • Marks glab duo ask as deprecated using Cobra's .Deprecated field, which automatically prints a warning on every invocation
  • Sets .Hidden = true so the command no longer appears in help output
  • Deprecation message directs users to glab duo cli with a removal date of 2026-07-26

Follows the same pattern used for glab pipeline ci → glab ci.

References gitlab#597732

Test plan

  • Run glab duo ask how do I undo my last commit — verify deprecation warning is printed before output
  • Run glab duo --help — verify ask no longer appears in the command list
Edited by Kai Armstrong

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